- Standard Form of Equation of Circle
- General Form of Equation of Circle
- More on General Form of Equation of Circle
- Equation of Circle Passing Though Three Non-Collinear Points
- More on Equation of Circle Passsing Through 3 Non-Collinear Points
- Equation of Circle Passing Through 2 Points and its Centre on Line
- Equation-Circle Passing Though 2 Points with 1 Tangential Point
- Equation-Circle Passing Though 2 Points with 1 Tangential Point-1
- Equation-Circle Passing Through 2 Points and Line
- Equation-Circle Passing Through 2 Points and Line

- Condition that Line may be Tangent to Circle
- Equation of Tangent to Circle
- More on Equation of Tangent to Circle
- Problem1- Equation of Tangent to Circle
- Problem2a-Equation of Tangent to Circle
- Problem2b-Equation of Tangent to Circle
- Equation of Normal to Circle
- Problem-Points Lie Inside, Outside or on the Circle
- Points Lie Inside, Outside or on the Circle
- Line Intersects Circle at Most 2 Points
- Length of Tangent to Circle
- Proof-2 Tangents can be Drawn to Circle from Point
- More on Proof-2 Tangents can be Drawn to Circle from Point

- Chords Perpendicular Passes Centre of Circle
- More on Chords Perpendicular Passes Centre of Circle
- Congruent Chords are Equidistance from Centre of Circle
- More on Congruent Chords are Equidistance from Centre of Circle
- To Prove Circles Diameter is 2 Times its Radius
- Line From Centre and Midpoint of Chord is Perp to it
- More on Line From Centre and Midpoint of Chord is Perp to it
- Angle in Semi-Circle is Right Angle
- More on Angle in Semi-Circle is Right Angle
- Perpendicular Radial Segment is Tangent to Circle
- More on Perpendicular Radial Segment is Tangent to Circle